If Yasuo attacks and his attack trigger kills one of my two defending units, does my remaining unit get the 'defending alone' bonus?

Ruling: It depends on whether Yasuo's ability is a "when" or "while" trigger.

Sequence:

• If it's a "when" trigger: The defending alone window has already passed, so the remaining unit does not get the bonus
• If it's a "while" trigger: The passive effect continually evaluates, so the remaining unit does get the defending alone bonus

Nuances:

• "When" abilities trigger at a specific moment and don't retroactively apply
• "While" abilities are passive effects that continuously check game state